A body which is initially at rest at a height `h=6400 km` above the surface of the earth of radius `R(6400 km)`, falls freely towards the earth. If its velocity on reaching the surface of earth is `2^(N) xx 10^(3) m / (s)`, then calculate `N`. (Take `g=` acceleration due to gravity on the surface of the earth `=10 (m) / (s)^(2)` )

Answer

3